Claude Sonnet 4.5vsGPT OSS 120B
Claude Sonnet 4.5 wins 70% of 25 blind community votes against GPT OSS 120B on Rival.
| Spec | Claude Sonnet 4.5 | GPT OSS 120B |
|---|---|---|
| Win rate | 70% | 30% |
| Input price | $3/M tokens | $0.18/M tokens |
| Output price | $15/M tokens | $0.8/M tokens |
| Context window | 200K tokens | 131K tokens |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Sep 2025 | Aug 2025 |
Our Verdict
Claude Sonnet 4.5Winner
GPT OSS 120BRunner-up
Pick Claude Sonnet 4.5. In 25 blind votes, Claude Sonnet 4.5 wins 70% of the time. That's not luck.
Claude Sonnet 4.5 wins Image Generation and Reasoning. GPT OSS 120B costs 19x less per token.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
GPT OSS 120B
Input
$0.18
17× cheaper
Output
$0.80
19× cheaper
GPT OSS 120B is cheaper on both: 17× input, 19× output.
Where to run it
22 hosts, cheapest first
GPT OSS 120B18 hosts
AkashMLbf16$0.03 in$0.17 out131k99.9% upCoreWeavefp4$0.03 in$0.17 out131k99.9% upDeepInfrabf16$0.04 in$0.17 out131k99.4% upDigitalOcean$0.06 in$0.39 out128k99.7% upMancerfp8$0.06 in$0.50 out131k99.6% upGoogle Vertex AI$0.09 in$0.36 out131k99.9% up
12 more hostsFewer hosts
Basetenfp4$0.10 in$0.50 out128k100% upParasailfp4$0.10 in$0.75 out131k100% upSambaNova$0.14 in$0.95 out131k96.9% upAmazon Bedrock$0.15 in$0.60 out131k98.1% upGroq$0.15 in$0.60 out131k100% upNebiusfp4$0.15 in$0.60 out131k96.2% upTogether$0.15 in$0.60 out131k98.8% upCerebrasfp16$0.35 in$0.75 out131k100% upNovitafp4degraded$0.05 in$0.25 out131k86.7% upSiliconFlowfp8degraded$0.05 in$0.45 out131k84.3% upPhaladegraded$0.15 in$0.60 out131k88.8% upMaradegraded$0.15 in$0.75 out131k86% up
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
40%
Claude Sonnet 4.5 uses 4.9x more sentence length
Claude Sonnet 4.5
GPT OSS 120B
64%Vocabulary52%
94wSentence Length19w
0.48Hedging0.28
4.9Bold7.4
8.0Lists1.8
0.45Emoji0.15
1.91Headings0.73
0.07Transitions0.17
Based on 20 + 21 text responses
Research
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FAQ
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